CN112095703A - Falling weight type hydraulic breaking hammer and equipment - Google Patents
Falling weight type hydraulic breaking hammer and equipment Download PDFInfo
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- CN112095703A CN112095703A CN202010895412.1A CN202010895412A CN112095703A CN 112095703 A CN112095703 A CN 112095703A CN 202010895412 A CN202010895412 A CN 202010895412A CN 112095703 A CN112095703 A CN 112095703A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/30—Auxiliary apparatus, e.g. for thawing, cracking, blowing-up, or other preparatory treatment of the soil
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Abstract
The invention discloses a falling weight type hydraulic breaking hammer and equipment, and the technical scheme is as follows: the hydraulic hammer comprises a hammering device and a hydraulic system, wherein the hammering device comprises a guide cylinder and a heavy hammer arranged in the guide cylinder, the heavy hammer is connected with a lifting mechanism, and the lifting mechanism is connected with the hydraulic system; the lifting mechanism can drive the heavy hammer to move axially along the guide cylinder under the action of the hydraulic system. The invention has simple structure, high production efficiency and stable working process.
Description
Technical Field
The invention relates to the technical field of mining machinery, in particular to a falling weight type hydraulic breaking hammer and equipment.
Background
Among the commonly used crushing apparatuses, hammer type crushing apparatuses are widely used, such as crushers, hydraulic hammers, and the like. The hammering device is a device for converting hydraulic energy input by a main machine into mechanical impact energy, is usually mounted on engineering machines such as loaders and excavators, can complete rock breaking, building dismantling and other works, and is widely applied to mining engineering and civil engineering. Large-scale waste materials and waste residues are generated in the production process of the steel industry, and a hammering device is often used for completing the tasks of slag removal, slag crushing and the like of a steel ladle.
The hammering device is internally provided with a very heavy hammer head, and mainly realizes the stone breaking by utilizing the great impact energy generated by the free falling of a hammer with large mass from a certain height. The most important technical performance of the hammering device is the impact energy of impact every time, the reasonable improvement of impact frequency is effective on the crushing effect of ores, the mass of the heavy hammers generally ranges from several tons to more than ten tons, and equipment capable of realizing a certain number of impacts per minute needs to be equipped, so that the impact efficiency is improved, and the economic benefit is realized.
Most quartering hammers that use in the existing market all are hydraulic breaking hammers, because hydraulic breaking hammers' structure is complicated, use and maintenance cost are high, and single impact energy is little, and is lower to the crushing efficiency of large-scale ore and hard material, leads to the production efficiency of relevant trade to be difficult to improve.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a falling weight type hydraulic breaking hammer and equipment, which are simple in structure, high in production efficiency and stable in working process.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, an embodiment of the present invention provides a drop weight type hydraulic breaking hammer, including a hammering device and a hydraulic system, where the hammering device includes a guide cylinder and a heavy hammer disposed inside the guide cylinder, the heavy hammer is connected to a lifting mechanism, and the lifting mechanism is connected to the hydraulic system; the lifting mechanism can drive the heavy hammer to move axially along the guide cylinder under the action of the hydraulic system.
As a further implementation manner, the lifting mechanism comprises a hydraulic motor, a winding drum, a pulley assembly and a steel cable, the hydraulic motor is installed on the side surface of the guide cylinder, the hydraulic motor is connected with the winding drum, the steel cable is wound along the circumferential direction of the winding drum, and the steel cable is connected with the heavy hammer by bypassing the pulley assembly.
As a further implementation manner, the pulley assembly comprises a fixed pulley and a movable pulley, the fixed pulley is provided with a plurality of fixed pulleys and is arranged side by side, and the steel cable sequentially passes through the fixed pulley and the movable pulley and is connected to the fixed pulley corresponding to the upper part of the movable pulley; and a speed reducer is arranged in the winding drum.
As a further implementation mode, a linear guide rail is installed inside the guide cylinder, and a guide rail sliding groove matched with the linear guide rail is formed in the outer side of the heavy hammer.
As a further realization mode, the control system comprises a proportional valve connected with the hydraulic motor, the proportional valve is connected with the controller through an oil way selector, and the proportional valve is connected with the water cooler.
As a further implementation manner, the control system further comprises a mode converter and an air cooler which are respectively connected with the hydraulic motor, wherein the air cooler is connected with the oil path selector, and the mode converter is connected with the controller and the mode switch; the controller is connected with the travel switch.
As a further implementation, the hydraulic motor is connected with an oil supply.
As a further implementation mode, a connecting piece is installed on the side surface of the guide cylinder at a set distance from the bottom, and an oil pipe and a hydraulic valve group are fixed on the same side above the connecting piece.
In a second aspect, the embodiment of the invention also provides crushing equipment comprising the hydraulic crushing hammer.
As a further implementation mode, the hydraulic breaking hammer is connected with the engineering machinery through a connecting piece.
The beneficial effects of the above-mentioned embodiment of the present invention are as follows:
(1) one or more embodiments of the present invention include a weight connected to a drum via a wire rope, the drum being driven by a hydraulic motor, which is simple in structure, high in production efficiency, and stable in working process;
(2) in one or more embodiments of the invention, a braking device is installed, and in the rising stage of the heavy hammer, the braking device can brake the heavy hammer in time when the heavy hammer rises to a preset position at the top end of the device so as to prevent the heavy hammer from rising too high continuously and causing danger; in the falling stage of the heavy hammer, the braking device starts braking before the heavy hammer reaches impact, unnecessary failure of a mechanism caused by overshoot of a steel cable due to inertia after the heavy hammer is hammered is avoided, the heavy hammer can be lifted again immediately after the impact, and the hammering frequency of the device can be improved;
(3) according to one or more embodiments of the invention, the hydraulic system for lifting the heavy hammer directly utilizes the original hydraulic power source of the engineering machinery; the hydraulic motor is connected with hydraulic elements such as a hydraulic valve and the like through an oil pipe and is finally connected with an oil pump and an oil tank on the engineering machinery through the oil pipe; the movement period of the heavy hammer is short, the hammering frequency is high, the stroke of the heavy hammer is long, and the energy of each impact is large;
(4) one or more embodiments of the present invention include a travel switch for detecting the position of a weight; in the heavy hammer rising stage, the rising position of the heavy hammer needs to be detected, so that the heavy hammer can brake in time when rising to a preset position at the top end of the device; during the falling phase of the weight, the position of each impact will change due to the impact process. The falling position of the heavy hammer is judged through the travel switch, so that the initial moment of hydraulic braking can be adapted to the latest impact position of the heavy hammer, and the braking process can be ensured to be started just before the current impact position.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a front view of the present invention in accordance with one or more embodiments;
FIG. 2 is a side view of the present disclosure according to one or more embodiments;
FIG. 3 is a schematic illustration of a crown block installation according to one or more embodiments of the present invention;
FIG. 4 is a schematic view of a movable pulley and a weight according to one or more embodiments of the present invention;
FIG. 5 is a schematic view of a cable and weight connection according to one or more embodiments of the present invention;
FIG. 6 is a schematic illustration of a hydraulic motor coupled to a spool in accordance with one or more embodiments of the present disclosure;
FIG. 7 is a front view of a weight according to one or more embodiments of the present invention;
FIG. 8 is a top view of a weight according to one or more embodiments of the present invention;
FIG. 9 is a schematic illustration of a hydraulic system according to one or more embodiments of the present disclosure;
the hydraulic control system comprises a guide cylinder 1, a guide cylinder 2, a hydraulic motor 3, a winding drum 4, a heavy hammer 5, a hydraulic valve group 6, an oil pipe 7, a first connecting piece 8, a steel cable 9, a fixed pulley 10, a movable pulley 11, a second connecting piece 12, a fixing piece 13, a proportional valve 14, a controller 15, an oil way selector 16, a mode converter 17, a mode switch 18, an oil supply device 19, a first travel switch 20, a second travel switch 21, a water cooler 22 and an air cooler.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in this application, if any, merely indicate correspondence with the directions of up, down, left and right of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted", "connected", "fixed", and the like in the present application should be understood broadly, and for example, the terms "mounted", "connected", and "fixed" may be fixedly connected, detachably connected, or integrated; the two components can be connected directly or indirectly through an intermediate medium, or the two components can be connected internally or in an interaction relationship, and the terms can be understood by those skilled in the art according to specific situations.
The first embodiment is as follows:
the embodiment provides a falling weight type hydraulic breaking hammer, which comprises a hammering device and a hydraulic system, wherein the hammering device is connected with the hydraulic system. As shown in fig. 1 and 2, the hammering device includes a guide cylinder 1, a lifting mechanism, and a weight 4, the weight 4 is disposed in the guide cylinder 1, and the weight 4 is connected to the lifting mechanism, and the lifting mechanism drives the weight 4 to move along the axial direction of the guide cylinder 1, so as to realize hammering.
Specifically, the guide cylinder 1 is a cylinder or a square cylinder with a hollow inner part and is formed by welding profile steels. The guide cylinder 1 is internally provided with a linear guide rail which extends from the bottom to the top along the axial direction, and the heavy hammer 4 is connected with the linear guide rail in a sliding way. A first connecting piece 7 is installed on the side face of the guide cylinder 1, and the first connecting piece 7 is used for connecting the breaking hammer and engineering machinery.
An oil pipe 6 and a hydraulic valve group 5 are arranged above the first connecting piece 7, and the hydraulic motor 2 is connected with hydraulic elements such as the hydraulic valve group 5 through the oil pipe 6 and finally connected with an oil pump and an oil tank on the engineering machinery through the oil pipe 6. The first connecting piece 7 is a set distance away from the bottom of the guide cylinder 1, and in order to shorten the length of the oil pipe 6 and save cost, the first connecting piece 7 and the hydraulic valve group 5 in the middle are arranged on the same side of the guide cylinder 1. The bottom of the guide cylinder 1 is a main hammering force bearing area, and the shell is thicker than other parts.
As shown in FIG. 7 and FIG. 8, the cross section of the weight 4 is adapted to the shape of the guiding cylinder 1, and the end of the weight 4 has a circular conical head. The outer side of the heavy hammer 4 is provided with a guide rail sliding groove which is matched with the linear guide rail. When the guide cylinder is not in operation, the weight 4 is located at the bottom of the interior of the guide cylinder 1, and the upper end of the weight 4 is directly connected with the steel cable 8 or connected with the movable pulley 10 passing around the steel cable 8.
The lifting mechanism comprises a hydraulic motor 2, a winding drum 3, a pulley assembly and a steel cable 8, as shown in fig. 6, the hydraulic motor 2 is installed on the side surface of the guide cylinder 1, the hydraulic motor 2 is connected with the winding drum 3, the winding drum 3 can rotate under the action of the hydraulic motor 2, and then the steel cable 8 is tightened to lift the heavy hammer 4. Further, a fixing piece 12 is arranged on the side surface of the guide cylinder 1, and the hydraulic motor 2 is arranged above the fixing piece 12; the reel drum 3 is connected to the hydraulic motor 2 via a second connection 11.
The hydraulic motor 2 and the winding drum 3 are connected through a coupler or directly connected, and a speed reducer is arranged inside the winding drum 3 and used for changing the rotating speed of the winding drum 3. In the embodiment, the speed reducer adopts a planetary load split-flow speed reducer, and the speed reducer has reliable work, high bearing capacity and small occupied volume. The hydraulic motor 2 provides the torque required for the rotation of the drum 3, and the drum 3 rotates to move the wire rope 10 wound thereon, thereby lifting the weight 4.
The steel cable 8 is wound along the circumferential direction of the winding drum 3, and one end of the steel cable 8 is connected with the heavy hammer 4 inside the guide cylinder 1 by bypassing the pulley component. As shown in fig. 3-5, the pulley assembly includes two fixed pulleys 9 and two movable pulleys 10, in this embodiment, the fixed pulleys 9 serve to support the cable 8 and guide the movement track of the cable 8; one movable pulley 10 is provided. Two fixed pulleys 9 are arranged side by side, the fixed pulley 9 is arranged at the top of the guide cylinder 1, and the movable pulley 10 is arranged at the top of the heavy hammer 4.
One of the fixed pulleys 9 corresponds to the movable pulley 10, and the center of the fixed pulley 9 is aligned with the right edge (with reference to the direction shown in fig. 4) of the movable pulley 10. The steel cable 8 sequentially passes through the tops of the two fixed pulleys 9 and passes through the lower part of the driven pulley 10; the wire 8 is then connected under the fixed pulley 9 in a position corresponding to the position of the movable pulley 10.
As shown in fig. 9, the hydraulic motor 2 is connected to a hydraulic system, the hydraulic system includes a proportional valve 13, a controller 14, an oil path selector 15, a mode converter 16, a mode switch 17, an oil supply device 18, a travel switch, a water cooler 21, and an air cooler 22, the oil supply device 18 is connected to the hydraulic motor 2, and the oil supply device 18 can supply oil to the hydraulic system in time, so as to solve the problem of suction of the hydraulic circuit caused by rapid descent of the weight 4.
The hydraulic motor 2 is respectively connected with the air cooler 22 and the proportional valve 13 through pipelines, an oil path selector 15 is connected between the air cooler 22 and the proportional valve 13, and the oil path selector 15 is used for switching an oil path where the hydraulic motor 2 is located so as to change the motion state of the heavy hammer 4 or brake the hydraulic motor 2. The oil path selector 15 is connected to a pipeline between the hydraulic motor 2 and the proportional valve 13; the proportional valve 13 is connected with the water cooler 21, and the proportional valve 13 is used for controlling the on-off of the hydraulic circuit and the flow direction of the hydraulic oil.
A line between the hydraulic motor 2 and the air cooler 22 is connected to the mode converter 16, and the mode converter 16, the oil path selector 15, and the proportional valve 13 are connected to the controller 14. The controller 14 controls the processes of lifting and braking, lowering and braking the weight 4 according to the signals fed back by the travel switch and the like. A mode switch 17 is connected between the mode converter 16 and the controller 14, and the mode converter 16 and the mode switch 17 can convert the apparatus into a normal operation mode or a maintenance mode.
The embodiment further comprises a braking device for rotation of the reel 3, wherein the braking device can brake the weight 4 when the weight 4 ascends to a preset position at the top end of the device in time in order to prevent the risk of the weight 4 continuously ascending too high. In the falling stage of the weight 4, the braking device makes braking start before the weight 4 reaches the impact, so that after the weight 4 is hammered, the wire rope 8 is overshot due to inertia, which causes unnecessary failure of the mechanism, and the weight 4 can be lifted again immediately after the impact, thereby increasing the hammering frequency of the device.
The brake device adopts a hydraulic brake mode, and the oil path selector 15 changes the oil path to brake the hydraulic motor 2 so as to brake the winding drum 3. The hydraulic brake by the oil path selector 15 is an effective method for achieving rapid braking of the hydraulic motor 2. Compared with the traditional mechanical braking mode, the hydraulic braking mode adopted by the embodiment is simple in braking method, and the phenomenon of wearing parts can be avoided.
In the present embodiment, two travel switches, namely a first travel switch 19 and a second travel switch 20 are provided, and the first travel switch 19 and the second travel switch 20 are respectively connected to the controller 14; the position of the weight 4 is detected by the first and second stroke switches 19 and 20. The purpose of detecting the position of the weight 4 is to determine when to actuate the hydraulic brake, so that the braking process is more accurate. In the heavy hammer rising stage, the rising position of the heavy hammer 4 needs to be detected, so that the heavy hammer 4 can brake in time when rising to a preset position at the top end of the device; during the falling phase of the weight 4, the position of each impact will change due to the impact process. The falling position of the weight 4 is determined by the travel switch so that the initial moment of hydraulic braking can be adapted to the latest impact position of the weight to ensure that the braking process can be started just before the current impact position.
When the weight 4 is lifted to the top preset position by the lifting mechanism, the position detected by the first travel switch 19 is then braked, so that the weight 4 is rapidly stopped. The engineering machine moves the hammering device to a hammering position, places the hammering device above an object to be hammered, then an operator starts a hammering button, the controller 14 sends a hammering instruction to the oil path selector 15, and the oil path selector 15 directly conducts two oil ports of the motor. Under the action of the falling weight, the weight 4 starts to fall.
When the weight 4 falls to the preset braking position, the second travel switch 20 is triggered, the second travel switch 20 feeds back a braking signal to the controller 14, and the braking process is started before the weight 4 reaches the impact, so as to prevent the steel cable 8 from overshooting. Then, the weight 4 strikes the object to be hammered to complete one hammering operation. Since the next hammering position is changed after one hammering action is completed, the controller 14 automatically adjusts the starting position and the timing of the hydraulic brake before the next hammering according to the position of the hammer 4 after hammering. Hammering was repeated until crushing was complete.
In this embodiment, the port P of the proportional valve 13 is communicated with a power oil source, and the port T is an oil return port and is communicated with an oil tank. In the ascending mode, when the controller 14 sends an ascending command to the weight 4, the right position of the proportional valve 13 operates, the oil path selector 15 connects the port P of the proportional valve 13 to the port on the upper end of the hydraulic motor 2, and the mode converter 16 is in the normal operating mode, and can limit the maximum oil pressure of the port on the upper end of the hydraulic motor 2, and the port on the lower end of the hydraulic motor 2 is communicated with the port T. Then, the high-pressure hydraulic oil flows in from the upper port of the hydraulic motor 2 and flows back to the oil tank from the lower port, and the hydraulic motor 2 drives the spool 3 to raise the weight 4.
When the weight 4 rises to a predetermined height, the first travel switch 19 is triggered, and the controller 14 issues a command to operate the proportional valve 13 at the middle position or the left position. If the proportional valve 13 is in the middle position, and the system can be in the maintenance state through the mode switch 17, the position of the weight 4 in the air is not changed. When the mode switch 17 is in the mode in which the weight 4 descends while the proportional valve 13 is in the neutral position, the oil path selector 15 connects the upper port and the lower port of the hydraulic motor 2, the hydraulic motor 2 rotates in reverse, and the weight 4 descends rapidly by the falling weight.
During the process of lowering the weight 4, the oil may generate heat seriously due to the very fast reverse rotation speed of the hydraulic motor 2, and the system cools the oil through the air cooler 22 and the water cooler 21. In addition, during the process of falling the weight 4, the speed of reverse rotation of the hydraulic motor 2 is very fast, so that cavitation is possible, and the system automatically supplies oil to the motor through the oil supply device 18 to prevent cavitation. The controller 14 can perform hydraulic braking on the hydraulic motor 2 at any time by adjusting the magnitude and direction of a signal sent to the oil path selector 15, thereby controlling the lowering speed of the counterweight 4.
Example two:
the embodiment provides crushing equipment, which comprises engineering machinery and the hydraulic crushing hammer of the first embodiment, wherein the hydraulic crushing hammer is arranged in front of the engineering machinery through a first connecting piece 7.
The heavy hammer 4 is used for pumping hydraulic oil in an oil tank of the engineering machinery through a hydraulic oil pump installed on the engineering machinery, the hydraulic oil enters the hydraulic motor 2 through the proportional valve 13 to drive the hydraulic motor 2 to rotate, the winding drum 3 is further driven to rotate, the heavy hammer 4 is lifted through the steel cable 8 and the pulley assembly, and the heavy hammer 4 is accelerated to ascend along a linear guide rail inside the guide cylinder 1.
When the weight 4 is lifted to near the top, the position of the weight 4 is detected by the travel switch, the controller 14 sends a signal to the braking device, the braking device is started, the rotation of the reel 3 is stopped, and the weight 4 is stopped at the preset height. Switching the mode that the oil way falls to weight 4, short circuit hydraulic motor 2 is in the oil way, and weight 4 falls rapidly under the effect of self falling weight, and reel 3 is driven by weight 4 to reverse. The braking process is started before the weight 4 strikes, so that the overshoot of the cable when the hammer occurs can be avoided or reduced.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A falling weight type hydraulic breaking hammer is characterized by comprising a hammering device and a hydraulic system, wherein the hammering device comprises a guide cylinder and a heavy hammer arranged in the guide cylinder, the heavy hammer is connected with a lifting mechanism, and the lifting mechanism is connected with the hydraulic system; the lifting mechanism can drive the heavy hammer to move axially along the guide cylinder under the action of the hydraulic system.
2. The hydraulic drop weight breaker of claim 1 wherein the lifting mechanism comprises a hydraulic motor mounted to the side of the guide cylinder, a spool, a pulley assembly, and a cable wound around the spool and connected to the weight via the pulley assembly.
3. A drop weight hydraulic breaker according to claim 2 wherein the pulley assembly comprises a plurality of fixed pulleys and a movable pulley, the fixed pulleys being arranged side by side, the wire rope passing over the fixed pulleys, the movable pulley and being connected to the fixed pulleys above the movable pulley; and a speed reducer is arranged in the winding drum.
4. The hydraulic drop weight breaking hammer as claimed in claim 1, wherein the guide cylinder is internally provided with a linear guide rail, and the outer side of the weight is provided with a guide rail sliding groove matched with the linear guide rail.
5. A drop weight hydraulic breaker hammer as claimed in claim 2 wherein the control system includes a proportional valve connected to the hydraulic motor, the proportional valve being connected to the controller via an oil selector, the proportional valve being connected to a water cooler.
6. The hydraulic drop-weight breaking hammer according to claim 5, wherein the control system further comprises a mode converter and an air cooler which are respectively connected with the hydraulic motor, the air cooler is connected with the oil path selector, and the mode converter is connected with the controller and the mode switch; the controller is connected with the travel switch.
7. A drop weight hydraulic demolition hammer as claimed in claim 5, wherein the hydraulic motor is connected to an oil supply.
8. A drop weight hydraulic breaking hammer as claimed in claim 1, wherein the guide cylinder is provided with a connecting member at a side surface thereof spaced from the bottom thereof by a predetermined distance, and an oil pipe and a hydraulic valve block are fixed to the same side above the connecting member.
9. A breaking apparatus comprising a hydraulic breaking hammer according to any one of claims 1-8.
10. A crushing plant according to claim 9, characterised in that the hydraulic crushing hammer is connected to the working machine by means of a connecting element.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010895412.1A CN112095703B (en) | 2020-08-31 | 2020-08-31 | Falling weight type hydraulic breaking hammer and equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010895412.1A CN112095703B (en) | 2020-08-31 | 2020-08-31 | Falling weight type hydraulic breaking hammer and equipment |
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| CN112095703A true CN112095703A (en) | 2020-12-18 |
| CN112095703B CN112095703B (en) | 2022-02-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023110036A1 (en) * | 2021-12-14 | 2023-06-22 | Fractum Aps | A hammering device and a method for operating a hammering device |
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| US6491114B1 (en) * | 2000-10-03 | 2002-12-10 | Npk Construction Equipment, Inc. | Slow start control for a hydraulic hammer |
| CN101275398A (en) * | 2008-03-29 | 2008-10-01 | 周荣珍 | Pile hammer |
| CN105264144A (en) * | 2013-04-19 | 2016-01-20 | 弗拉克图姆2012公司 | A hammering device and a method for operating a hammering device |
| CN103422505A (en) * | 2013-07-30 | 2013-12-04 | 意宁液压股份有限公司 | Full-automatic hydraulic piling machine using freely-lowering winch for driving heavy hammer |
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| WO2023110036A1 (en) * | 2021-12-14 | 2023-06-22 | Fractum Aps | A hammering device and a method for operating a hammering device |
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| CN112095703B (en) | 2022-02-22 |
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